import { describe, it, expect, vi, afterEach } from 'vitest';
import { createKillSwitchClient } from './index.js';

describe('createKillSwitchClient', () => {
  const baseConfig = {
    baseUrl: 'http://localhost:4003/api',
    productId: 'testapp',
  };

  afterEach(() => {
    vi.restoreAllMocks();
  });

  it('should return disabled=false when app is not disabled', async () => {
    vi.stubGlobal(
      'fetch',
      vi.fn().mockResolvedValue({
        ok: true,
        json: () => Promise.resolve({ disabled: false, message: null }),
      })
    );

    const ks = createKillSwitchClient(baseConfig);
    const result = await ks.check();

    expect(result.disabled).toBe(false);
    expect(result.message).toBeNull();
  });

  it('should return disabled=true with message when app is disabled', async () => {
    vi.stubGlobal(
      'fetch',
      vi.fn().mockResolvedValue({
        ok: true,
        json: () => Promise.resolve({ disabled: true, message: 'Maintenance in progress' }),
      })
    );

    const ks = createKillSwitchClient(baseConfig);
    const result = await ks.check();

    expect(result.disabled).toBe(true);
    expect(result.message).toBe('Maintenance in progress');
  });

  it('should fail-open on network error', async () => {
    vi.stubGlobal('fetch', vi.fn().mockRejectedValue(new Error('network')));

    const ks = createKillSwitchClient(baseConfig);
    const result = await ks.check();

    expect(result.disabled).toBe(false);
    expect(result.message).toBeNull();
  });

  it('should fail-open on non-OK response', async () => {
    vi.stubGlobal(
      'fetch',
      vi.fn().mockResolvedValue({
        ok: false,
        status: 500,
      })
    );

    const ks = createKillSwitchClient(baseConfig);
    const result = await ks.check();

    expect(result.disabled).toBe(false);
  });

  it('should send correct product-id header', async () => {
    const fetchMock = vi.fn().mockResolvedValue({
      ok: true,
      json: () => Promise.resolve({ disabled: false }),
    });
    vi.stubGlobal('fetch', fetchMock);

    const ks = createKillSwitchClient(baseConfig);
    await ks.check();

    expect(fetchMock).toHaveBeenCalledWith(
      expect.stringContaining('/flags/kill-switch'),
      expect.objectContaining({
        headers: expect.objectContaining({ 'x-product-id': 'testapp' }),
      })
    );
  });

  it('should include platform in query string', async () => {
    const fetchMock = vi.fn().mockResolvedValue({
      ok: true,
      json: () => Promise.resolve({ disabled: false }),
    });
    vi.stubGlobal('fetch', fetchMock);

    const ks = createKillSwitchClient({ ...baseConfig, platform: 'ios' });
    await ks.check();

    const url = fetchMock.mock.calls[0][0] as string;
    expect(url).toContain('platform=ios');
  });
});